package com.eatme.leetcode.problems;

import com.eatme.core.stack.ArrayStack;

public class Solution20 {
    public  boolean isValid(String s) {
        ArrayStack<Character> stack = new ArrayStack<>();
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            if (c=='('||c=='['||c=='{')
                stack.push(c);
            else {
                if (stack.isEmpty())
                    return false;
                char topChar = stack.pop();
                if (c==')' && topChar!='(')
                    return false;
                if (c==']' && topChar!='[')
                    return false;
                if (c=='}' && topChar!='{')
                    return false;
            }
        }
        return stack.isEmpty();
    }



    public static void main(String[] args) {
        System.out.println(new Solution20().isValid("(){}[]"));
        System.out.println(new Solution20().isValid("([)]"));
    }
}
